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Welded joints are often applied to ships and ocean structures. Fatigue strength evaluation for the welded joints is important for assessing structural integrity of welded structures. In recent years, effective computational techniques for analyzing fracture mechanics problems and the crack propagation simulations have been proposed. In addition, the simulation for complex shaped geometry is easy to handle for the development of computational power. In this study, fatigue strength evaluation based on the crack propagation is examined. In the numerical examples, crack propagation analyses of surface crack in T-shaped welded joints are carried out for employing the computational techniques. Mk factors, crack paths and fatigue cycles are evaluated and are compared with existing techniques. Effectiveness of the fatigue strength evaluation based on the new techniques is discussed.

A study for numerical techniques for fatigue crack propagation analysis of surface crack in welded joints